Imidazole-induced contractions in bovine tracheal smooth muscle are not dependent on the cAMP pathway

The mechanism of imidazole-induced contraction on the bovine tracheal smooth muscle was investigated. Imidazole induced muscle contraction in a concentration-dependent manner on bovine, porcine and guinea-pig tracheas, but not in rat or mouse. In bovine tracheas, imidazole was cumulatively applied a...

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Bibliographic Details
Published in:Journal of Veterinary Medical Science 2018, Vol.80(2), pp.341-345
Main Authors: KANEDA, Takeharu, KANDA, Hidenori, TAJIMA, Tsuyoshi, URAKAWA, Norimoto, SHIMIZU, Kazumasa
Format: Article
Language:English
Subjects:
Acetylcholine
Atropine
Calcium (intracellular)
Calcium ions
cAMP
Cyclic AMP
Guinea pigs
Imidazole
Indomethacin
Muscle contraction
Muscles
Muscular function
Pharmacology
Physostigmine
Rodents
Smooth muscle
Tetrodotoxin
Trachea
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Summary:The mechanism of imidazole-induced contraction on the bovine tracheal smooth muscle was investigated. Imidazole induced muscle contraction in a concentration-dependent manner on bovine, porcine and guinea-pig tracheas, but not in rat or mouse. In bovine tracheas, imidazole was cumulatively applied and induced muscle tension and increasesd intracellular Ca2+ level in a concentration -dependent manner. Imidazole, even at 300 µM, the concentration at which maximum contractile response occurs, did not significantly increase in cAMP content relative to control. Atropine inhibited imidazole-induced contraction at a concentration- dependent manner and pretreatment of hemicholinium-3 almost abolished imidazole-induced contraction. Conversely, pretreatment of tripelennamine, indomethacin or tetrodotoxin did not affect imidazole-induced contraction. Acetylcholine or eserine induced contraction in bovine, porcine, guinea pig, rat and mice trachea in a concentration-dependent manner. However, there was little difference in the rank order of maximum contraction of these agents. Imidazole-induced contraction was greater in bovine trachea compared to the other species tested. Further, cAMP did not appear to play a role in imidazole-induced contraction, suggesting other mechanisms, such as the release of endogenous acetylcholine.
ISSN:0916-7250
1347-7439
DOI:10.1292/jvms.17-0526